Get corn nicely developed in process vital for growth (8,5)
I believe the answer is:
nitrogen cycle
'process vital for growth' is the definition.
(chemical cycle needed for life)
'get corn nicely developed' is the wordplay.
'developed' is an anagram indicator.
'get'+'corn'+'nicely'='getcornnicely'
'getcornnicely' anagrammed gives 'NITROGEN CYCLE'.
'in' is the link.
I've seen this clue in The Times.
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